Robin Roberts reveals she is gay in thank-you note to GMA fans

I am grateful for my entire family, my long time girlfriend, Amber, and friends as we prepare to celebrate a glorious new year together. I am grateful for the many prayers and well wishes for my recovery. I return every one of them to you 100 fold." (Ida Mae Astute/ABC)

In a touching pre-New Year's message, "Good Morning America" co-host and cancer survivor Robin Roberts gratefully thanked her loved ones for a milestone year of health, among them she mentioned her longtime girlfriend.

It was the first time the popular ABC News morning show host had publicly acknowledged that she is a lesbian.

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It was the first time the popular ABC News morning show host had publicly acknowledged that she is a lesbian. (Robin Roberts via Facebook)

Roberts survived a bone marrow transplant in 2012 to treat myelodysplastic syndrome, a disorder spurred by her treatment for breast cancer. The treatment included undergoing chemotherapy to destroy her diseased bone marrow. (Michael Tran/FilmMagic)

"I am grateful to God, my doctors and nurses for my restored good health," Roberts wrote on her Facebook page Sunday afternoon. "I am grateful for my sister, Sally-Ann, for being my donor and giving me the gift of life.

Sunday marked the one-year anniversary of newswoman's critical 100 days post transplant. She gleefully marked the occasion a year ago when doctors said her immune system was strong enough handle allowing her beloved pooch, KJ, to move back into her apartment. (Allen Berezovsky/WireImage)

I am grateful for my entire family, my long time girlfriend, Amber, and friends as we prepare to celebrate a glorious new year together. I am grateful for the many prayers and well wishes for my recovery. I return every one of them to you 100 fold."

"On this last Sunday of 2013 I encourage you to reflect on what you are grateful for too," she wrote on Facebook. "Wishing you a Healthy and Happy New Year." (Robin Marchant/Getty Images)

Roberts' girlfriend, Amber Laign, is a licensed massage therapist who specializes in treating patients recovering from injuries, sources said. The couple met through mutual friends and have been in a committed relationship, living together in New York, for more than ten years.

Roberts survived a bone marrow transplant in 2012 to treat myelodysplastic syndrome, a disorder spurred by her treatment for breast cancer. The treatment included undergoing chemotherapy to destroy her diseased bone marrow.

Sunday marked the one-year anniversary of newswoman's critical 100 days post transplant. She gleefully marked the occasion a year ago when doctors said her immune system was strong enough handle allowing her beloved pooch, KJ, to move back into her apartment.

"On this last Sunday of 2013 I encourage you to reflect on what you are grateful for too," she wrote on Facebook. "Wishing you a Healthy and Happy New Year."